{"instruction": "You are an expert in relationship extraction. Please extract relationship triples that match the schema definition from the input. Return an empty list for relationships that do not exist. Please respond in the format of a JSON string.", "schema": ["product producer", "message topic"], "input": "natural history programmes began as live outside broadcasts on bbc television in the early 1950s ."}
{"product producer": [], "message topic": [{"subject": "natural history", "object": "programmes"}]}